I say run a few strafing missions with A10's ( https://en.wikipedia.org/wiki/Fairch...Thunderbolt_II ) , Then have some some attack helicopters ( https://en.wikipedia.org/wiki/Attack_helicopter ) neutralize any enemy resistance with Hellfire missiles ( https://en.wikipedia.org/wiki/AGM-114_Hellfire ) and finish up with some crop dusters using a mix of Weed-B-Gone and Roundup or just drop some Napalm (https://en.wikipedia.org/wiki/Napalm ).
That ought to send a clear message.
Is it time for a regime change in Mexico?